These concepts look nice, but never take into account the difficulty of working on complex projects with multiple people that hierarchical filesystem actually work well on.

There's absolutely no way you could build an app in a big "bucket 'o' files". Sure, you can put together a flyer for a softball game or (maybe) type up a simplistic report for school, but eventually these "loops" are going to become big, unusable buckets of content that isn't easily searchable (do we have good search on music contents yet? better hope the filename is good before it goes into the bucket!).

Perhaps the answer here is a "subloop". That's starting to look like we've come around to nested document folders again, isn't it?

Somewhat amusing: the screenshot of Sublime Text in the mockup is using folders.